Heat sink for led bulbs

ABSTRACT

A heat sink for LED bulbs includes a base having male threads engaged with a socket connected to a power and female threads engaged with male threads of a base connector. The base connector has a chamber co-working with a chamber of a lamp casing to accommodate a controller, and locking projections to fix the lamp casing. The lamp casing is formed as a trumpet, having plural positioning projections and an outer surface coated with a heat dispersing paint to scatter heat created by LED bulbs. A heat conducting plate is placed in a top circumference of the lamp casing, interlocked with the positioning projections. A circuit board has a positioning hole locked upward by a bar of the heat conducting plate, with LED bulbs laid on the circuit board. A bulb hood is capped on the lamp casing.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a heat sink for LED bulbs, particularly to one provided with a lamp casing having an outer surface coated with a heat dispersing paint to quickly scatter heat created by LED bulbs to the air outside LED lamps, also prolonging service life of LED bulbs.

2. Description of the Prior Art

Commonly, as disclosed in Taiwan Patent No. M402387, a conventional heat sink for LED bulbs includes a heat dispersing base made of aluminum, having a through hole provided with plural air grooves communicated to the outer wall of one end. Located on the outer wall of the heat dispersing base are plural heat dispersing blades, with a heat dispersing groove formed between every two adjacent heat dispersing blades. The conventional heat sink also includes a heat conducting plate fixed on the heat dispersing base and made of aluminum as well. The heat conducting plate is provided with a slot formed in one side for being engaged with a projected rim of the heat dispersing base, and an accommodating chamber having the inner wall bored with plural heat dispersing holes corresponding to the heat dispersing grooves of the heat dispersing base and a narrow through hole. That is, the heat dispersing base and the heat conducting plate are mainly employed as heat dispersing devices fro the conventional heat sink. However, the heat dispersing base and the heat conducting plate have to be primarily shaped with aluminum and then finely finished by finishing machines before becoming final products. Although the heat dispersing base and the heat conducting plate have an advantage of dispersing heat quickly due to being made of aluminum, they require complicated manufacturing processes to step up cost, posing LED lamps too costly to be popular.

SUMMARY OF THE INVENTION

The object of this invention is to offer a heat sink for LED bulbs, with a cost reduction to make green eco-friendly LED lamps popular enough so as to lessen carbon emission.

The heat sink for LED bulbs in the invention is mainly provided with a lamp casing coated with a heat dispersing paint to swiftly scatter heat produced by LED bulbs, achieving a low cost of manufacturing LED lamps.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a perspective view of a first preferred embodiment of a heat sink for LED bulbs in the present invention;

FIG. 2 is an exploded perspective view of the first preferred embodiment of a heat sink for LED bulbs in the present invention;

FIG. 3 is a cross-sectional view of the first preferred embodiment of a heat sink for LED bulbs in the present invention;

FIG. 4 is a cross-sectional view of a second preferred embodiment of a heat sink for LED bulbs in the present invention;

FIG. 5 is a cross-sectional view of a third preferred embodiment of a heat sink for LED bulbs in the present invention;

FIG. 6 is an exploded perspective view of a fourth preferred embodiment of a heat sink for LED bulbs in the present invention; and

FIG. 7 is a perspective view of a fifth preferred embodiment of a heat sink for LED bulbs in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 1-3, a preferred embodiment of a heat sink for LED bulbs in the present invention at least includes a base 1, a base connector 2, a lamp casing 3, a heat conducting plate 4, a circuit board 5 and a bulb hood 6.

The base 1 is provided with male threads 10 used to engage with a socket connected to a power, and female threads 11 to engage with the base connector 2.

The base connector 2 is provided with male threads 20 for engaging with the female threads 11 of the base 1, and a chamber 21 possessing an upper circumferential wall 22 combined with a chamber 35 of the lamp casing 3 to accommodate a power module. In addition, the base connector 2 is also provided with an extending circumferential wall 23, plural locking projections 24 built on the extending circumferential wall 23 to interlock with the lamp casing 3, and an outer circumferential wall 25.

The lamp casing 3 is formed like a trumpet, provided with an inner engaging circumferential wall 30 to interlock with the locking projections 24 of the base connector 2, as shown in FIGS. 3-5, with a bottom circumference 31 resting on the outer circumferential wall 25 of the base connector 2, so as to keep the lamp casing 3 stably combined with the base connector 2. The lamp casing 3 also has plural positioning projections 32 formed around an inner wall of a top edge to fix the heat conducting plate 4, as shown in FIG. 3, or a supporting circumferential wall 32A to fix the heat conducting plate 4, as shown in FIG. 5. A heat-dispersing paint is coated on an outer surface 33 or an inner surface 34 or both so as to scatter heat created by LED bulbs. The chamber 35 of the lamp casing 3 is to accommodate a power module 7 that has a bottom resting on the upper circumferential wall 22 of the chamber 21 of the base connector 2. So the power module 7 is stably confined in the chamber 35 of the lamp casing 3 and the chamber 21 of the base connector 2. Furthermore, as shown in FIGS. 3 and 4, formed on the inner surface around the opening of the lamp casing 3 is an irregular inner surface 34 having some portion shaped as a curved surface 340 for fixing the heat conducting plate 4. Or, as shown in FIGS. 4 and 5, a combining circumferential wall 36 is formed around the edge of the opening of the lamp casing 3, used to position the bulb hood 6.

The lamp casing 3 is formed airtight, as shown in FIGS. 3-6, or provided with plural heat scattering holes 37 spaced apart properly, as shown in FIG. 7. With the heat scattering holes 37 co-working with the heat dispersing paint coated on the lamp casing, heat scattering efficiency can be augmented to guarantee the long service life of LED bulbs.

Next, the heat conducting plate 4 is made of metal, inserted from the opening of the lamp casing 3 and installed therein. The heat conducting plate 4 is provided with an upward extended circumferential wall 40 having an outer curved surface 400. When the heat conducting plate 4 is inserted downward into the lamp casing 3 to a certain level, the outer curved surface 400 is to tightly contact with the curved surface 340 of the lamp casing 3, so that the heat conducting plate 4 can not only stably rest in the lamp casing 3, but also effectively transfer heat produced by LED bulbs to the lamp casing 3 to swiftly scatter out. And with the positioning projections 32 locked with the circumferential wall 40 of the heat conducting plate 4, the heat conducting plate 4 can be further fixed with the lamp casing 3, as shown in FIGS. 3 and 4. Furthermore, the heat conducting plate 4 is additionally provided with an upright bar 42 located on the bottom wall for interlocking with a positioning hole 50 of the circuit board 5, and two bolt holes 43 to be screwed with bolts 430. So the circuit board 5 can be fixedly positioned on the heat conducting plate 4.

The circuit board 5 is positioned on the heat conducting plate 4 to be laid with LED diodes 51 to light up. Or, as shown in FIG. 6, the heat conducting plate 4 and the circuit board 5 can be integrally made as a whole one to save cost, wherein the heat conducting plate 4 is replaced with a heat conducting plate 4A made of insulation materials, with LED diodes laid on it.

The bulb hood 6 is capped on the lamp casing 3, provided with an inward circumferential wall 60 flatly extended inward from the bottom edge, and a downward circumferential wall 61 extended downward from the inward circumferential wall 60. As shown in FIG. 3, a glue 8 can be coated on the inward circumferential wall 60 and the downward circumferential wall 61 to fasten the bulb hood 6 with the lamp casing 3. Or, as shown in FIGS. 4 and 5, a hook 62 is extended outward from the downward circumferential wall 61 to combine with the combining circumferential wall 36 of the lamp casing 3, with the bulb hood 6 combined with the lamp casing 3.

With the lamp casing 3, the bulb hood 6 and the heat dispersing device assembled together in this invention, the LED bulbs can not only lower cost largely, but also maintain their deserved service life, enabling the LED bulbs to be more popular to achieve a reduction of carbon dioxide emission and save energy, more eco-friendly.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A heat sink for LED bulbs, said heat sink at least comprising: a base provided with male threads employed to engage with a socket and female threads used to engage with male threads of a base connector; said base connector provided with a chamber co-working with a chamber of a lamp casing to accommodate a power module, said base connector further having plural locking projections to interlock with said lamp casing; said lamp casing provided with plural positioning projections to fix a heat conducting plate and having an outer surface or an inner surface or both coated with a heat dispersing paint to scatter heat produced by LED bulbs; said heat conducting plate installed in said lamp casing and provided with an upward extended circumferential wall utilized to lock with said positioning projections of the lamp casing and contact with said inner wall of said lamp casing so that said heat conducting plate can be stably combined with said lamp casing, a circuit board being fixed on said heat conducting plate to accommodate LED bulbs; and a bulb hood being capped on said lamp casing and combined together with said lamp casing by a glue.
 2. The heat sink for LED bulbs as claimed in claim 1, wherein said chamber of said base connector possesses an upper circumferential wall co-working with said chamber of said lamp casing to install a power module.
 3. The heat sink for LED bulbs as claimed in claim 1, wherein said locking projections are built on an extending circumferential wall of said base connector.
 4. The heat sink for LED bulbs as claimed in claim 1, wherein said base connector is provided with an outer circumferential wall to combine with a bottom circumference of said lamp casing.
 5. The heat sink for LED bulbs as claimed in claim 1, wherein, with an inner engaging circumferential wall of said lamp casing interlocked with said locking projections of said base connector, and with said bottom circumference of said lamp casing resting on said outer circumferential wall of said base connector, said lamp casing is stably combined with said base connector.
 6. The heat sink for LED bulbs as claimed in claim 1, wherein, with an outer curved surface of said upward extended circumferential wall of said heat conducting plate totally attached with an inner curved surface of said lamp casing, said heat conducting plate is stably confined in said lamp casing, and therefore the position of said heat conductive plate is restricted.
 7. The heat sink for LED bulbs as claimed in claim 6, wherein, with said heat conducting plate inserted downward from an opening of said lamp casing to contact with said inner curved surface of said lamp casing and with said positioning projections of said lamp casing interlocked with said upward extended circumferential wall of said heat conducting plate, said heat conducting plate is further combined with said lamp casing.
 8. The heat sink for LED bulbs as claimed in claim 1, wherein said power module is installed in said chamber of said lamp casing to rest on said upper circumferential wall of said base connector, so that said power module is fixed tightly in said chamber of said lamp casing and said chamber of said base connector.
 9. The heat sink for LED bulbs as claimed in claim 1, wherein said lamp casing is formed airtight.
 10. The heat sink for LED bulbs as claimed in claim 1, wherein said lamp casing is formed with plural heat scattering holes.
 11. The heat sink for LED bulbs as claimed in claim 1, wherein said bulb hood is fastened together with said lamp casing by a glue coated between an inward circumferential wall and a downward circumferential wall of said bulb hood and an inner wall of said lamp casing.
 12. The heat sink for LED bulbs as claimed in claim 1, wherein said heat conducting plate and said circuit board are integrally made as a whole one, with said heat conducting plate made of insulation materials to install LED bulbs.
 13. A heat sink for LED bulbs, said heat sink at least comprising: a base provided with male threads employed to engage with a socket and female threads used to engage with male threads of a base connector; said base connector provided with a chamber co-working with a chamber of a lamp casing to accommodate a power module, said base connector further having plural locking projections to interlock with said lamp casing; said lamp casing provided with a supporting circumferential wall to bolster a heat conducting plate and having an outer surface or an inner surface or both coated with a heat dispersing paint to scatter heat produced by LED bulbs; said heat conducting plate installed on said supporting circumferential wall of said lamp casing and having a top combined with a circuit board to accommodate LED bulbs; and a bulb hood being capped on said lamp casing and combined together with said lamp casing by a glue.
 14. The heat sink for LED bulbs as claimed in claim 12, wherein said chamber of said base connector possesses an upper circumferential wall co-working with said chamber of said lamp casing to install a power module.
 15. The heat sink for LED bulbs as claimed in claim 13, wherein said locking projections are built on an extending circumferential wall of said base connector.
 16. The heat sink for LED bulbs as claimed in claim 13, wherein said base connector is provided with an outer circumferential wall to combine with a bottom circumference of said lamp casing.
 17. The heat sink for LED bulbs as claimed in claim 13, wherein, with an inner engaging circumferential wall of said lamp casing interlocked with said locking projections of said base connector and with said bottom circumference of said lamp casing resting on said outer circumferential wall of said base connector, said lamp casing is stably combined with said base connector.
 18. The heat sink for LED bulbs as claimed in claim 13, wherein said heat conducting plate is laid on said supporting circumferential wall of said lamp casing.
 19. The heat sink for LED bulbs as claimed in claim 13, wherein said bulb hood is fixed with said lamp casing by locking a combining circumferential wall of said lamp casing with a hook extended outward from a downward circumferential wall of said bulb hood.
 20. The heat sink for LED bulbs as claimed in claim 13, wherein said power module is installed in said chamber of said lamp casing to rest on said upper circumferential wall of said base connector, so that said power module is fixed in said chamber of said lamp casing and said chamber of said base connector.
 21. The heat sink for LED bulbs as claimed in claim 13, wherein said lamp casing is formed airtight . . .
 22. The heat sink for LED bulbs as claimed in claim 13, wherein said lamp casing is formed with plural heat scattering holes.
 23. The heat sink for LED bulbs as claimed in claim 13, wherein said bulb hood is fastened together with said lamp casing by a glue coated between an inward circumferential wall and a downward circumferential wall of said bulb hood and an inner wall of said lamp casing.
 24. The heat sink for LED bulbs as claimed in claim 13, wherein said heat conducting plate and said circuit board are integrally made as a whole one, with said heat conducting plate made of insulation materials to install LED diodes. 